From e95b1e6a2ed1031b5ac054f4e457d001a981d726 Mon Sep 17 00:00:00 2001 From: Jakub Jelinek Date: Fri, 9 Jun 2000 16:31:54 +0200 Subject: [PATCH] configure.in: Check whether gas supports -relax. * configure.in: Check whether gas supports -relax. * configure, config.in: Rebuilt. * config/sparc/sparc.h (ASM_RELAX_SPEC): Define. (EXTRA_SPECS): Add asm_relax. (ASM_SPEC): Add %(asm_relax). (TARGET_SWITCHES): Add -mrelax and -mno-relax. * config/sparc/linux64.h (LINK_ARCH_SPEC): Rename to LINK_SPEC. (LINK_SPEC): Pass -relax to linker unless -mno-relax or -r. (ASM_SPEC): Add %(asm_relax). * config/sparc/linux.h (LINK_SPEC, ASM_SPEC): Likewise. * config/sparc/sparc.c (output_sibcall): If HAVE_AS_RELAX_OPTION, never use sethi/jmpl for leaf tail calls. Use or with rs2 %g0 instead of mov, so that gas can further optimize it. From-SVN: r34466 --- gcc/ChangeLog | 16 ++++++++++++++++ gcc/config.in | 3 +++ gcc/config/sparc/linux.h | 4 +++- gcc/config/sparc/linux64.h | 7 ++++--- gcc/config/sparc/sparc.c | 14 ++++++++++++-- gcc/config/sparc/sparc.h | 12 ++++++++++-- gcc/configure | 38 +++++++++++++++++++++++++++++++++----- gcc/configure.in | 19 +++++++++++++++++++ 8 files changed, 100 insertions(+), 13 deletions(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 1971ecbedb2..f09a3bbcd06 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,19 @@ +2000-06-09 Jakub Jelinek + + * configure.in: Check whether gas supports -relax. + * configure, config.in: Rebuilt. + * config/sparc/sparc.h (ASM_RELAX_SPEC): Define. + (EXTRA_SPECS): Add asm_relax. + (ASM_SPEC): Add %(asm_relax). + (TARGET_SWITCHES): Add -mrelax and -mno-relax. + * config/sparc/linux64.h (LINK_ARCH_SPEC): Rename to LINK_SPEC. + (LINK_SPEC): Pass -relax to linker unless -mno-relax or -r. + (ASM_SPEC): Add %(asm_relax). + * config/sparc/linux.h (LINK_SPEC, ASM_SPEC): Likewise. + * config/sparc/sparc.c (output_sibcall): If HAVE_AS_RELAX_OPTION, + never use sethi/jmpl for leaf tail calls. Use or with rs2 %g0 + instead of mov, so that gas can further optimize it. + 2000-06-08 James E. Wilson * dwarf2out.c (size_of_die, case dw_val_class_const): Use diff --git a/gcc/config.in b/gcc/config.in index 1ed9c208b09..6521a6e255b 100644 --- a/gcc/config.in +++ b/gcc/config.in @@ -426,6 +426,9 @@ /* Define if your assembler supports .register. */ #undef HAVE_AS_REGISTER_PSEUDO_OP +/* Define if your assembler supports -relax option. */ +#undef HAVE_AS_RELAX_OPTION + /* Define if the assembler supports 64bit sparc. */ #undef AS_SPARC64_FLAG diff --git a/gcc/config/sparc/linux.h b/gcc/config/sparc/linux.h index 75d09273e80..b92ecd57631 100644 --- a/gcc/config/sparc/linux.h +++ b/gcc/config/sparc/linux.h @@ -179,6 +179,7 @@ Boston, MA 02111-1307, USA. */ #endif #else #define LINK_SPEC "-m elf32_sparc -Y P,/usr/lib %{shared:-shared} \ + %{!mno-relax:%{!r:-relax}} \ %{!shared: \ %{!ibcs: \ %{!static: \ @@ -191,7 +192,8 @@ Boston, MA 02111-1307, USA. */ It's safe to pass -s always, even if -g is not used. */ #undef ASM_SPEC #define ASM_SPEC \ - "%{V} %{v:%{!V:-V}} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Wa,*:%*} -s %{fpic:-K PIC} %{fPIC:-K PIC}" + "%{V} %{v:%{!V:-V}} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Wa,*:%*} -s %{fpic:-K PIC} \ + %{fPIC:-K PIC} %(asm_relax)" /* Same as sparc.h */ #undef DBX_REGISTER_NUMBER diff --git a/gcc/config/sparc/linux64.h b/gcc/config/sparc/linux64.h index 18a7f8b2c34..0f87b2cfc06 100644 --- a/gcc/config/sparc/linux64.h +++ b/gcc/config/sparc/linux64.h @@ -246,6 +246,7 @@ Boston, MA 02111-1307, USA. */ #define LINK_SPEC "\ %(link_arch) \ %{mlittle-endian:-EL} \ +%{!mno-relax:%{!r:-relax}} \ " #undef CC1_SPEC @@ -283,7 +284,7 @@ Boston, MA 02111-1307, USA. */ #else /* !SPARC_BI_ARCH */ #undef LINK_SPEC -#define LINK_ARCH_SPEC "-m elf64_sparc -Y P,/usr/lib64 %{shared:-shared} \ +#define LINK_SPEC "-m elf64_sparc -Y P,/usr/lib64 %{shared:-shared} \ %{!shared: \ %{!ibcs: \ %{!static: \ @@ -291,6 +292,7 @@ Boston, MA 02111-1307, USA. */ %{!dynamic-linker:-dynamic-linker /lib64/ld-linux.so.2}} \ %{static:-static}}} \ %{mlittle-endian:-EL} \ +%{!mno-relax:%{!r:-relax}} \ " #endif /* !SPARC_BI_ARCH */ @@ -308,8 +310,7 @@ Boston, MA 02111-1307, USA. */ %{Wa,*:%*} \ -s %{fpic:-K PIC} %{fPIC:-K PIC} \ %{mlittle-endian:-EL} \ -%(asm_cpu) %(asm_arch) \ -" +%(asm_cpu) %(asm_arch) %(asm_relax)" /* Same as sparc.h */ #undef DBX_REGISTER_NUMBER diff --git a/gcc/config/sparc/sparc.c b/gcc/config/sparc/sparc.c index 18873966f2f..2b44d2f1bc1 100644 --- a/gcc/config/sparc/sparc.c +++ b/gcc/config/sparc/sparc.c @@ -3737,7 +3737,15 @@ output_sibcall (insn, call_operand) if (leaf_regs) { +#ifdef HAVE_AS_RELAX_OPTION + /* If as and ld are relaxing tail call insns into branch always, + use or %o7,%g0,X; call Y; or X,%g0,%o7 always, so that it can + be optimized. With sethi/jmpl as nor ld has no easy way how to + find out if somebody does not branch between the sethi and jmpl. */ + int spare_slot = 0; +#else int spare_slot = ((TARGET_ARCH32 || TARGET_CM_MEDLOW) && ! flag_pic); +#endif int size = 0; if ((actual_fsize || ! spare_slot) && delay_slot) @@ -3786,9 +3794,11 @@ output_sibcall (insn, call_operand) { if (size) fprintf (asm_out_file, "\tsub\t%%sp, -%d, %%sp\n", size); - output_asm_insn ("mov\t%%o7, %%g1", operands); + /* Use or with rs2 %%g0 instead of mov, so that as/ld can optimize + it into branch if possible. */ + output_asm_insn ("or\t%%o7, %%g0, %%g1", operands); output_asm_insn ("call\t%a0, 0", operands); - output_asm_insn (" mov\t%%g1, %%o7", operands); + output_asm_insn (" or\t%%g1, %%g0, %%o7", operands); } return ""; } diff --git a/gcc/config/sparc/sparc.h b/gcc/config/sparc/sparc.h index 5b226578d8b..1a584cda69b 100644 --- a/gcc/config/sparc/sparc.h +++ b/gcc/config/sparc/sparc.h @@ -324,12 +324,17 @@ Unrecognized value in TARGET_CPU_DEFAULT. %{!m32:%{!m64:%(asm_arch_default)}} \ " +#ifdef HAVE_AS_RELAX_OPTION +#define ASM_RELAX_SPEC "%{!mno-relax:-relax}" +#else +#define ASM_RELAX_SPEC "" +#endif + /* Special flags to the Sun-4 assembler when using pipe for input. */ #define ASM_SPEC "\ %| %{R} %{!pg:%{!p:%{fpic:-k} %{fPIC:-k}}} %{keep-local-as-symbols:-L} \ -%(asm_cpu) \ -" +%(asm_cpu) %(asm_relax)" #define LIB_SPEC "%{!shared:%{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p} %{g:-lg}}" @@ -362,6 +367,7 @@ Unrecognized value in TARGET_CPU_DEFAULT. { "asm_cpu_default", ASM_CPU_DEFAULT_SPEC }, \ { "asm_arch32", ASM_ARCH32_SPEC }, \ { "asm_arch64", ASM_ARCH64_SPEC }, \ + { "asm_relax", ASM_RELAX_SPEC }, \ { "asm_arch_default", ASM_ARCH_DEFAULT_SPEC },\ { "asm_arch", ASM_ARCH_SPEC }, \ SUBTARGET_EXTRA_SPECS @@ -606,6 +612,8 @@ extern int target_flags; {"no-stack-bias", -MASK_STACK_BIAS, "Do not use stack bias" }, \ {"faster-structs", MASK_FASTER_STRUCTS, "Use structs on stronger alignment for double-word copies" }, \ {"no-faster-structs", -MASK_FASTER_STRUCTS, "Do not use structs on stronger alignment for double-word copies" }, \ + {"relax", 0, "Optimize tail call instructions in assembler and linker" }, \ + {"no-relax", 0, "Do not optimize tail call instructions in assembler or linker" }, \ SUBTARGET_SWITCHES \ { "", TARGET_DEFAULT, ""}} diff --git a/gcc/configure b/gcc/configure index 1cbe6cb9110..5dda2dbfd35 100755 --- a/gcc/configure +++ b/gcc/configure @@ -8916,10 +8916,38 @@ EOF fi + echo $ac_n "checking assembler supports -relax""... $ac_c" 1>&6 +echo "configure:8921: checking assembler supports -relax" >&5 +if eval "test \"`echo '$''{'gcc_cv_as_relax_opt'+set}'`\" = set"; then + echo $ac_n "(cached) $ac_c" 1>&6 +else + + gcc_cv_as_relax_opt=unknown + if test x$gcc_cv_as != x; then + # Check if gas supports -relax + echo ".text" > conftest.s + if $gcc_cv_as -relax -o conftest.o conftest.s > /dev/null 2>&1; then + gcc_cv_as_relax_opt=yes + else + gcc_cv_as_relax_opt=no + fi + rm -f conftest.s conftest.o + fi + +fi + +echo "$ac_t""$gcc_cv_as_relax_opt" 1>&6 + if test "x$gcc_cv_as_relax_opt" = xyes; then + cat >> confdefs.h <<\EOF +#define HAVE_AS_RELAX_OPTION 1 +EOF + + fi + case "$tm_file" in *64*) echo $ac_n "checking for 64 bit support in assembler ($gcc_cv_as)""... $ac_c" 1>&6 -echo "configure:8923: checking for 64 bit support in assembler ($gcc_cv_as)" >&5 +echo "configure:8951: checking for 64 bit support in assembler ($gcc_cv_as)" >&5 if eval "test \"`echo '$''{'gcc_cv_as_flags64'+set}'`\" = set"; then echo $ac_n "(cached) $ac_c" 1>&6 else @@ -8964,7 +8992,7 @@ EOF if test "x$gcc_cv_as_flags64" != xno; then echo $ac_n "checking for assembler offsetable %lo() support""... $ac_c" 1>&6 -echo "configure:8968: checking for assembler offsetable %lo() support" >&5 +echo "configure:8996: checking for assembler offsetable %lo() support" >&5 if eval "test \"`echo '$''{'gcc_cv_as_offsetable_lo10'+set}'`\" = set"; then echo $ac_n "(cached) $ac_c" 1>&6 else @@ -9003,7 +9031,7 @@ EOF i[34567]86-*-*) echo $ac_n "checking assembler instructions""... $ac_c" 1>&6 -echo "configure:9007: checking assembler instructions" >&5 +echo "configure:9035: checking assembler instructions" >&5 gcc_cv_as_instructions= if test x$gcc_cv_as != x; then set "filds fists" "filds mem; fists mem" @@ -9133,7 +9161,7 @@ fi # Build a new-libstdc++ system (ie libstdc++-v3) echo $ac_n "checking for libstdc++ to install""... $ac_c" 1>&6 -echo "configure:9137: checking for libstdc++ to install" >&5 +echo "configure:9165: checking for libstdc++ to install" >&5 # Check whether --enable-libstdcxx-v3 or --disable-libstdcxx-v3 was given. if test "${enable_libstdcxx_v3+set}" = set; then enableval="$enable_libstdcxx_v3" @@ -9157,7 +9185,7 @@ EOF echo $ac_n "checking whether to enable maintainer-specific portions of Makefiles""... $ac_c" 1>&6 -echo "configure:9161: checking whether to enable maintainer-specific portions of Makefiles" >&5 +echo "configure:9189: checking whether to enable maintainer-specific portions of Makefiles" >&5 # Check whether --enable-maintainer-mode or --disable-maintainer-mode was given. if test "${enable_maintainer_mode+set}" = set; then enableval="$enable_maintainer_mode" diff --git a/gcc/configure.in b/gcc/configure.in index bc4cf0712f6..90540547db1 100644 --- a/gcc/configure.in +++ b/gcc/configure.in @@ -4550,6 +4550,25 @@ case "$target" in [Define if your assembler supports .register.]) fi + AC_CACHE_CHECK([assembler supports -relax], + gcc_cv_as_relax_opt, [ + gcc_cv_as_relax_opt=unknown + if test x$gcc_cv_as != x; then + # Check if gas supports -relax + echo ".text" > conftest.s + if $gcc_cv_as -relax -o conftest.o conftest.s > /dev/null 2>&1; then + gcc_cv_as_relax_opt=yes + else + gcc_cv_as_relax_opt=no + fi + rm -f conftest.s conftest.o + fi + ]) + if test "x$gcc_cv_as_relax_opt" = xyes; then + AC_DEFINE(HAVE_AS_RELAX_OPTION, 1, + [Define if your assembler supports -relax option.]) + fi + case "$tm_file" in *64*) AC_CACHE_CHECK([for 64 bit support in assembler ($gcc_cv_as)], -- 2.30.2